Sahih Muslim Book 015, Hadith Number 4075.

Chapter : What a non-believer should do with his vow when he embraces Islam.

lbn 'Umar reported: When Allah's Apostle (may peace be upon him) came back from the Battle of Hunain, Umar asked Allah's Messenger (may peace be upon him) about the vow he had taken during the days of Ignorance that he would observe I'tikaf for a day. The rest of the hadith is the same.

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